1.. SPDX-License-Identifier: GPL-2.0 2 3================================== 4Macintosh HFS Filesystem for Linux 5================================== 6 7 8.. Note:: This filesystem doesn't have a maintainer. 9 10 11HFS stands for ``Hierarchical File System`` and is the filesystem used 12by the Mac Plus and all later Macintosh models. Earlier Macintosh 13models used MFS (``Macintosh File System``), which is not supported, 14MacOS 8.1 and newer support a filesystem called HFS+ that's similar to 15HFS but is extended in various areas. Use the hfsplus filesystem driver 16to access such filesystems from Linux. 17 18 19Mount options 20============= 21 22When mounting an HFS filesystem, the following options are accepted: 23 24 creator=cccc, type=cccc 25 Specifies the creator/type values as shown by the MacOS finder 26 used for creating new files. Default values: '????'. 27 28 uid=n, gid=n 29 Specifies the user/group that owns all files on the filesystems. 30 Default: user/group id of the mounting process. 31 32 dir_umask=n, file_umask=n, umask=n 33 Specifies the umask used for all files , all directories or all 34 files and directories. Defaults to the umask of the mounting process. 35 36 session=n 37 Select the CDROM session to mount as HFS filesystem. Defaults to 38 leaving that decision to the CDROM driver. This option will fail 39 with anything but a CDROM as underlying devices. 40 41 part=n 42 Select partition number n from the devices. Does only makes 43 sense for CDROMS because they can't be partitioned under Linux. 44 For disk devices the generic partition parsing code does this 45 for us. Defaults to not parsing the partition table at all. 46 47 quiet 48 Ignore invalid mount options instead of complaining. 49 50 51Writing to HFS Filesystems 52========================== 53 54HFS is not a UNIX filesystem, thus it does not have the usual features you'd 55expect: 56 57 * You can't modify the set-uid, set-gid, sticky or executable bits or the uid 58 and gid of files. 59 * You can't create hard- or symlinks, device files, sockets or FIFOs. 60 61HFS does on the other have the concepts of multiple forks per file. These 62non-standard forks are represented as hidden additional files in the normal 63filesystems namespace which is kind of a cludge and makes the semantics for 64the a little strange: 65 66 * You can't create, delete or rename resource forks of files or the 67 Finder's metadata. 68 * They are however created (with default values), deleted and renamed 69 along with the corresponding data fork or directory. 70 * Copying files to a different filesystem will loose those attributes 71 that are essential for MacOS to work. 72 73 74Creating HFS filesystems 75======================== 76 77The hfsutils package from Robert Leslie contains a program called 78hformat that can be used to create HFS filesystem. See 79<https://www.mars.org/home/rob/proj/hfs/> for details. 80 81 82Credits 83======= 84 85The HFS drivers was written by Paul H. Hargrovea (hargrove@sccm.Stanford.EDU). 86Roman Zippel (roman@ardistech.com) rewrote large parts of the code and brought 87in btree routines derived from Brad Boyer's hfsplus driver. 88